<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>

  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片视图区域 -->
<el-card>
    <!-- 警告区域 -->
    <el-alert
    title="注意：只允许为第三集分类设置相关参数！"
    type="warning"
    show-icon :closable="false">
  </el-alert>
  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt"> 
      <el-col>
          <span>
              选择商品分类：
          </span>
          <!-- 选择商品分类的级联选择框 -->
           <el-cascader
    v-model="selectedCateKeys"
    :options="catelist"
    :props="cateProps"
    @change="handleChange" ref="cascaderRef"></el-cascader>
      </el-col>
  </el-row>
  <!-- tab页签区域 -->
  <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数按钮 -->
        <el-button type="primary" size="mini"
        :disabled="isBtnDisabled"
        @click="addDialogVisible=true">添加参数
        </el-button>
        <!-- 动态参数表格 -->
        <el-table
      :data="manyTableData"
     border stripe>
     <!-- 展开行 -->
      <el-table-column
        type="expand">
        <template slot-scope="scope">
          <!-- 循环渲染Tag 标签 -->
          <el-tag v-for="(item,i) in scope.row.attr_vals" 
          :key="i" closable @close="handleClose(i,scope.row)">{{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input class="input-new-tag"
          v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
          ref="saveTagInput" size="small"
          @keyup.enter.native="handleInputConfirm(scope.row)"
          @blur="handleInputConfirm(scope.row)">
          </el-input>
          <!-- 添加按钮 -->
          <el-button v-else class="button-new-tag"
          size="small" @click="showInput(scope.row)">+New Tag

          </el-button>
        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column
        type="index"
         label="#">
      </el-table-column>
      <el-table-column
        prop="attr_name"
        label="参数名称">
      </el-table-column>
      <el-table-column label="操作">
          <template slot-scope="scope">

              <el-button size="mini" type="primary" icon="el-icon-edit"
               @click=" showEditDialog(scope.row.attr_id)">
              编辑
              </el-button>
               <el-button size="mini" type="danger" icon="el-icon-delete" 
               @click="removeParams(scope.row.attr_id)">
            删除
              </el-button>

          </template>
      </el-table-column>
    </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
        <el-button type="primary" size="mini" 
        :disabled="isBtnDisabled" @click="addDialogVisible=true" > 
        添加属性
        </el-button>
         <!-- 静态参数表格 -->
        <el-table
      :data="onlyTableData"
     border stripe>
     <!-- 展开行 -->

          <el-table-column
        type="expand">
        <template slot-scope="scope">
          <!-- 循环渲染Tag 标签 -->
          <el-tag v-for="(item,i) in scope.row.attr_vals" 
          :key="i" closable @close="handleClose(i,scope.row)">{{item}}
          </el-tag>
          <!-- 输入的文本框 -->
          <el-input class="input-new-tag"
          v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
          ref="saveTagInput" size="small"
          @keyup.enter.native="handleInputConfirm(scope.row)"
          @blur="handleInputConfirm(scope.row)">
          </el-input>
          <!-- 添加按钮 -->
          <el-button v-else class="button-new-tag"
          size="small" @click="showInput(scope.row)">+New Tag

          </el-button>
        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column
        type="index"
        label="#">
      </el-table-column>
      <el-table-column
        prop="attr_name"
        label="属性名称">
      </el-table-column>
      <el-table-column label="操作">
          <template slot-scope="scope">

              <el-button size="mini" type="primary" icon="el-icon-edit"
              @click=" showEditDialog(scope.row.attr_id)">
              编辑
              </el-button>
               <el-button size="mini" type="danger" icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">
            删除
              </el-button>

          </template>
      </el-table-column>
    </el-table>
    </el-tab-pane>
    
  </el-tabs>
</el-card>
<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%">
 <!-- 添加参数的对话框 -->
 <el-form ref="addFormRef" :model="addForm" label-width="100px" 
 :rules="addFormRules">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
 </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->

<el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%"
 @close=" editDialogClosed">
 <!-- 添加参数的对话框 -->
 <el-form ref="editFormRef" :model="editForm" 
 label-width="100px" :rules="editFormRules">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
 </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
//   商品分类列表
catelist:[],
// 级联选择框的配置对象
cateProps:{
    value:'cat_id',
    label:'cat_name',
    children:'children',
     expandTrigger:'hover',
            checkStrictly:true
},
//级联选择框双向绑定到的数组
selectedCateKeys:[],
// 被激活的页签的名称
activeName:'many',
// 动态参数的数据
manyTableData:[],
// 静态属性的数据
onlyTableData:[],
addDialogVisible:false,
// 添加参数的表单数据对象
addForm:{
  attr_name:''
},
// 添加表单的验证规则对象
addFormRules:{
  attr_name:[
    {
      required:true,message:'请输入参数名称',
      trigger:'blur'
    }
  ]
},
// 控制修改对话框的显示与隐藏
editDialogVisible:false,
// 修改的表单数据对象
editForm:{},
// 修改表单的验证规则对象
editFormRules:{
  attr_name:[
  {
      required:true,message:'请输入参数名称',
      trigger:'blur'
  }

  ]
},
// 控制按钮与文本框的切换显示
inputVisible:false,
// 文本框中输入的内容
inputValue:''

      
      }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类列表
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist=res.data
        },
        // 级联选择框选项中变化，会触发这个函数
     handleChange(){
        //   证明选中的不是三级分类
       this.getParamsData()
       this.$refs.cascaderRef.dropDownVisible=false
      } ,
    //   获取参数的列表数据
    async getParamsData(){
        // 证明选中的不是三级分类
        if(this.selectedCateKeys.length!==3){
            this.selectedCateKeys=[]
            this.manyTableData=[]
            this.onlyTableData=[]
            return
        }
          const {data:res}=await this.$http.get(
            `categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败！')
            }
            res.data.forEach(item=>{
              item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
              // 控制文本框的显示与隐藏
              item.inputVisible=false
              // 文本框中输入的值
              item.inputValue=''
            })
            if(this.activeName==='many'){
              this.manyTableData=res.data
            }
            else{
              this.onlyTableData=res.data
            }
    },

    // tab页签点击事件的处理函数
    handleTabClick(){
        this.getParamsData()
    },
    // 点击按钮，添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) return
        const{data:res}=await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name:this.addForm.attr_name,
            attr_sel:this.activeName
          }
        )
        if(res.meta.status!==201){
          return this.$message.error('添加参数失败！')

        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible=false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
   async showEditDialog(attr_id){
    //  查询当前参数的信息
    const {data:res}=await this.$http.get(
      `categories/${this.cateId}/attributes/${attr_id}`,{
        params:{attr_sel:this.activeName}
      }
    )
    if(res.meta.status!==200){
      return this.$message.error('获取参数信息失败！')
    }
    this.editForm=res.data
      this.editDialogVisible=true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return
        const {data:res}=await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name:this.editForm.attr_name,attr_sel:this.activeName
          })
          if(res.meta.status!==200){
            return this.$message.error('修改参数失败！')

          }
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible=false
      })
    } ,
    // 根据Id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult=await this.$confirm('此操作将永久删除该参数，是否继续？',
      '提示',{
        confirmButtonText:'确定',
        cancelButtonText:'取消',
        type:'warning'
      }
      ).catch(err=>err)
      // 用户取消了删除的操作
      if(confirmResult!=='confirm'){
        return this.$message.info('已取消删除！')
      }
      // 删除的业务逻辑
      const {data:res}=await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if(res.meta.status!==200){
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },

    // 文本框失去焦点，或摁下了enter都会触发
  async  handleInputConfirm(row){
      if(row.inputValue.trim().length===0){
        row.inputValue=''
  row.inputVisible=false
  return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue=''
      row.inputVisible=false
      // 需要发起请求，保存这次操作
     this.saveAttrVals(row)
    },
    // 将对attr_vals的操作，保存到数据库
   async saveAttrVals(row){
    //  需要发起请求，保存这次操作
       const {data:res}=await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
       attr_name:row.attr_name,
       attr_sel:row.attr_sel,
       attr_vals:row.attr_vals.join(' ')
        }
      )
  if(res.meta.status!==200){
    return this.$message.error('修改参数项失败')
  }
  this.$message.success('修改参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(row){

   row.inputVisible=true
  //  让文本框自动获得焦点
  // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
  // 箭头函数无参数可以写()或者_
  this.$nextTick(() =>{
this.$refs.saveTagInput.$refs.input.focus()
  })
  },
  // 删除对应的参数可选项
  handleClose(i,row){
    row.attr_vals.splice(i,1)
    this. saveAttrVals(row)
  }
   
   
    },
    computed:{
        // 如果按钮需要被禁用，则返回true，否则返回false

        isBtnDisabled(){
    return  this.selectedCateKeys.length!==3
        
    
        },
        // 当前选中的三级分类的Id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }



}
</script>
<style lang="less" scoped>
.cat_opt{
margin:15px 0
}
.el-tag{
  margin:10px ;
}
.input-new-tag{
  width: 120px;
}

</style>